Further Amazon annoyance

The downloaded shows from Amazon Prime Video on my Fire 10, which played fine offline before, no longer did on retest. The best theory appears to be an unobvious feature such that, once one starts a show, one has but two days to finish it. And, my few seconds' test started that timer. So, they're downloading again, I shan't test playback, I shall cross my fingers. Thank goodness for the retest.